Acids/Bases/Solutions

Which of these substances is acidic?

• tap water
• lemon
• ammonia
• baking soda

What is the most likely pH of a tube of toothpaste?

• 3
• 5
• 7
• 9

How is a standard hydrogen atom different from a hydrogen ion?

• a hydrogen ion has an extra electron.
• a hydrogen ion is missing an electron.
• a hydrogen ion has an extra proton.
• a hydrogen ion is missing a proton.

Why do metals dissolve when you dip them in acid?

• The buffers in the metal are eaten away by the acid.
• The electrons in the metal are stripped away by hydrogen ions.
• The hydrogen ions in the acid react with the hydroxyl ions in the metal.
• The acid reacts with the basic metal to form carbon dioxide gas and salt.

What might happen if you mixed a strong acid with an equally strong base?

• You would see an explosive chemical reaction.
• The acid would destroy the base.
• The base would destroy the acid.
• You'd wind up with a pH-neutral substance.

An extremely strong base would have a pH of:

• 1
• 7
• 9
• 14

This piece of pH paper has been dipped into:

• An acid
• A base
• A pH-neutral substance
• A buffer

What happens immediately after you dissolve acid in water?

• Positively charged hydrogen atoms are released.
• Hydronium ions are released.
• Negatively charged hydrogen atoms are released.
• Neutrally charged hydrogen atoms are released.

What might happen if acidi chemicals were emitted into the air by factories?  Choose the best answer.

• The acid would destroy metallic elements in the air.
• The acid would be neutralized by bases within clouds.
• Acid rain might destroy ecosystems and farmland.
• Violent chemical reactions would take place within the atmosphere.

Tags

NGSS.MS-ESS3-4

NGSS.MS-LS2-4

Which of the following substances is basic?

• soda
• lemon juice
• soap
• vinegar